如何使用嵌套集模型链接数据库中的web内容?

我的嵌套集合表如下所示。

 create table depts (
  id int identity(0, 1) primary key
  , lft int
  , rgt int
  , name nvarchar(60)
        , abbrv nvarchar(20)
 );

测试部门。

insert into depts (lft, rgt, name, abbrv) values (1, 14, 'root', 'r');
insert into depts (lft, rgt, name, abbrv) values (2, 3, 'department 1', 'd1');
insert into depts (lft, rgt, name, abbrv) values (4, 5, 'department 2', 'd2');
insert into depts (lft, rgt, name, abbrv) values (6, 13, 'department 3', 'd3');
insert into depts (lft, rgt, name, abbrv) values (7, 8, 'sub department 3.1', 'd3.1');
insert into depts (lft, rgt, name, abbrv) values (9, 12, 'sub department 3.2', 'd3.2');
insert into depts (lft, rgt, name, abbrv) values (10, 11, 'sub sub department 3.2.1', 'd3.2.1');

 create table content (
  id int identity(0, 1)
  , dept_id int
  , page_name nvarchar(60)
  , content ntext
 );

测试内容。

insert into content (dept_id, page_name, content) 
 values (3, 'index', '<h2>welcome to department 3!</h2>');
insert into content (dept_id, page_name, content) 
 values (4, 'index', '<h2>welcome to department 3.1!</h2>');
insert into content (dept_id, page_name, content) 
 values (6, 'index', '<h2>welcome to department 3.2.1!</h2>');
insert into content (dept_id, page_name, content) 
 values (2, 'what-doing', '<h2>what is department 2 doing?/h2>');

我正在尝试根据给定的url查询正确的页面内容(从content表)。我可以很容易地完成这个任务与根部门。然而,事实证明,查询具有多个深度的部门有点困难。例如:

http://localhost/departments.asp?d3/ (Should return <h2>welcome to department 3!</h2>)
http://localhost/departments.asp?d2/what-doing (Should return <h2>what is department 2 doing?</h2>)

我不确定这是否可以在一个查询中创建,或者是否需要某种递归函数。另外,如果在last/之后没有任何内容,那么假设我们需要索引页。

如何做到这一点?也欢迎提出意见和建议。

非常感谢。